Talk in general about the cardiac muscle tissue.

The middle part of the heart wall (the myocardium) is formed of a muscular tissue associated to an interstitial connective tissue rich in blood and lymphatic vessels and in nerve fibers. The myocardium is composed largely of striated muscular cells (cardiomyocytes). These cells allow, by their continuous rhythmic, spontaneous and involuntary contraction, blood propulsion and the emptying of cardiac cavities The myocardium is mainly constituted of muscle fibers, anastomosed and separated by thin septa of loose connective tissue rich in capillaries.